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Air-Flow Detector Circuit – Circuit Schematic
Air-Flow Detector Circuit
Two precision temperature sensors are used to detect a small temperature difference. When air flow occurs, self-heating of the LM335 is reduced, and the output...
Temperature To Frequency Converter Circuit – Circuit Schematic
Temperature To Frequency Converter Circuit
In this circuit an LM34 or LM35 produces a frequency proportional to temperature. Reference current (138 ) is set via R3....
Vcr Tv On-Off Control Circuit – Circuit Schematic
Vcr Tv On-Off Control Circuit
This circuit senses the video from the VCR. When the VCR is turned on, video signal is amplified by U3A and to drive Ql, activating Kl. In this manner, it is ...
Window Detector – Circuit Schematic
Window Detector
The high switching speed, low offset current and low offset voltage of the HA-4900 series make this window detector extreme...
Analog Voltage Camera-Image Tracker – Circuit Schematic
Analog Voltage Camera-Image Tracker
By using a low-cost RS-170 camera and this circuit, a voltage that trades the position of an object in ...
High-Accuracy Thermometer – Circuit Schematic
High-Accuracy Thermometer
This circuit combines a current source and a platinum RTD bridge to form a complete high-accuracy thermometer. Th...
Electronic Thermometer – Circuit Schematic
Electronic Thermometer
This thermometer is capable of measuring temperatures from - 30 to +120 °F. A diode-connected 2N3904 transistor form...
Single-Dc Supply Thermometer – Circuit Schematic
Single-Dc Supply Thermometer
Using a J-type thermocouple, this circuit can indicate temperatures from -350° to 400° with a 6-V supply or - ...
Electronic Thermometer – Circuit Schematic
Electronic Thermometer
This thermometer uses an NTC thermistor (RIO) to produce a dc voltage that decreases with temperature, to drive an I...
Inexpensive Linear Thermometer – Circuit Schematic
Inexpensive Linear Thermometer
As a sensor in the design of this linear thermometer, the LM34 is used. The output is the difference between...
Transistor Sensor Temperature Measurer – Circuit Schematic
Transistor Sensor Temperature Measurer
Using the fact that the VRE of a transistor shifts 59.16 mV per decade of current at 25°C. This cons...
Over-Temperature Switch – Circuit Schematic
Over-Temperature Switch
The output goes high when a preset temperature is exceeded. A fixed half-supply reference voltage feeds a reference...
Temperature Sensor – Circuit Schematic
Temperature Sensor
The AD537 uses its two reference outputs—one fixed at 1 V, the other of which varies with temperature (1 mV per °K). At ...
Under-Temperature Switch – Circuit Schematic
Under-Temperature Switch
The reference current is fed from the supply voltage via Rl, to the inverting terminal, and the variable (noninver...
Simple Temperature Indicator – Circuit Schematic
Simple Temperature Indicator
For the absolute measurement of temperatures, a thermometer is indispensable. However, in many situations, an ...
Temperature Controller – Circuit Schematic
Temperature Controller
A thermistor (RI) is compared with a reference (R2) in a Wheatstone-bridge circuit. Comparator Ul"s output goes high...
Thermocouple Temperature Control – Circuit Schematic
Thermocouple Temperature Control
This control, with zero-voltage load switching, uses a CA3130 BiMOS op amp and a CA3079 zero-voltage switc...
Temperature Controller With Defrost Cycle – Circuit Schematic
Temperature Controller With Defrost Cycle
This temperature controller has a range of -50 to +150°C and permits defrosting. R7, VR3, and R8 ...
(N + 1) Wires Connect N Hall-Effect Switches – Circuit Schematic
(N + 1) Wires Connect N Hall-Effect Switches
Hall-effect switches have several advantages over mechanically and optically coupled switches....
Simple Photoelectric Light Controller – Circuit Schematic
Simple Photoelectric Light Controller
A phototransistor senses daylight. At dusk, it ceases to conduct and Rl biases Q2, activates Kl, and ...